FAQ-The Definition of CRC Error Frame under Ethernet Interface

Publication Date: 2012-07-27Views: 55Downloads: 0

Issue Description

Q:What is the definition of CRC error frame under Ethernet interface?

Alarm Information

Null

Handling Process

A:1. Ethernet frame format: the whole length 64~1518 bytes = 60~1514 + 4 bytes CRCThe last 4 bytes are CRC of link layer.2. If CRC error and data (60-1514) is normal, it is common CRC error.3. If CRC is correct and data is less than 60 bytes, it is Runt. 4. If CRC is correct and data is more than 1514 bytes, it is Oversize.5. If CRC error and data is less than 60 bytes, it is Fragment.6. If CRC error and data is more than 1514 bytes, it is Jabber.7. One data frame does not form complete Byte, it is alignment. 8. When JAM signal occurs and there is Runt/Fragment/CRC error, it is collision.